Sunni

First Valid Nikah will establish the marriage bond, while the other Nikah will be just for show and will not add on the valid Nikah.
It is permissible to do the second Nikah for showing people.

Wassalam.

Muslim is not allowed to draw picture of beings with soul like human beings and animals.

If you draw part of the body, not the whole, many Ulama say that it will be permitted.

You need to either to change the drawings of the soul beings, or if it is not changeable, then get rid of it.

Wassalam.

The Prophet Muhammad (SAWA) never allowed Muslims to divide in to groups or sects. Sects were formed long time after the Prophet (SAWA). Muslims were ordered by the Prophet to keep following Quran and Ahlul Bayt. Political reasons and wrong rulers caused many Muslims to be away from Ahlul Bayt (AS) and follow different sects.

Mu'awiyah ibn Abi Sufyan announced the year 41 after Hijra when he became the top ruler on Muslims after his treaty with Imam Hasan (AS) as the year of Jamaa'ah عام الجماعة .

He ordered all his appointed Shaikhs on pulpits and sermons to curse Ameerul Mo'mineen Ali (AS). This evil habit continued for many generations till the rule of Omar Ibn Abdul Aziz who ordered to remove the curse. Many of Mo'awiyah followers did not like to leave cursing Ali and called it Sunnah and shouted demanding the continuation of the curse being part of the Sunnah. أين السنة؟ Where is the Sunnah?

The title of Ahl al-Sunnah was used by extreme Sunni Hanbali  Muslims even during their fights with other Sunni sects like the dispute between followers Abu Hanifah and Ibn Hanbal. Abu Hanifah school was called Ahlul Ra'y ( people of opinion) by Hanbalis and other Sunni sects.

The term Ahlul Sunnah wal Jama'ah was used during Abbasid government for and by those Muslims who do not follow Ahlul Bayt (AS) even if the show love and respect to them, but follow other sects.

We have Hadeeths from Ahlul Bayt (SS) stating: By Allah, no one is following the real Sunnah and unity of the Ummah but we and our followers

والله ليس على السنة والجماعة أحدٍ الا  ٫نحنوشيعتنا

Wassalam.

It is highly recommended for every Shia Muslim to pray with Muslims from other sects in their congregational prayers, but we need to recite Sura Al-Hamd and other Sura for ourself. Such Salaah will be valid if it was performed inside the time not before it.
Jum'a prayers with non Shia Muslims is good but we need to recite Dhuhr Prayer as well.
Wassalam.

Sunni sects are four:

1.  Hanafi Sunnis who follow Abu Hanifa Ibn No'maan  who was born on year 80 after Hijra, after 70 years of the passing away of the Prophet Muhammad (SAWA) and died on 150 after Hijra.

2. Shafi'ee Sunnis who follow Mohammad Ibn Edrees al-Shafi'ee who was born on year 150 after Hijra and passed away on 204 after Hijra.

3. Maliki Sunnis who follow Malik Ibn Anas who was born in 93 Hijri and passed away on 179 Hijri in Madinah.

4. Hanbali Sunnis who follow Ahmad Ibn Hanbal who was born in 164 Hijri and passed away on 241 Hijri.

Shia follow Ahlul Bayt who are Imam Ali, Fatimah, Imam Hasan, Imam Husain who lived with the Prophet Muhammad (SAWA). Then the 9 Imams from the kinship of Imam Husain (AS). 
Shia is not a sect but a title which is used in Quran for the sincere followers ( Sura Al-Saffaat 83 and Sura Al-Qassas 15). The Prophet Muhammad (SAWA) gave the title of Shia of Ali to the most pious of his companion and most obedient Muslims ( Tafseer Al-Tabari, V.30, P. 335) and Shawaahid al-Tanzeel by al-Hasakaani 2: 353 and Tafseer al-Dorr al- Manthour by Al-Soyouti 6:379.

Shia believe and follow the Prophetic order to all Muslims to keep following Quran and Ahlul Bayt (AS) to be andbremain on the Right Path. This Hadeeth is authentic and narrated in Saheeh Muslim 4425, and Tirmithi 3718 and 3720 and in many authentic Sunni books.

Shia follows the Prophetic Hadeeth that the successors of the Prophet will be twelve. (Saheeh al-Bukhari 6682, al-Tareekh al-Kabeer by Al-Bukhari 8:410), Saheeh Muslim 3393, 3394, 3395, 3396 and many other important Sunni books.

Shia believe that the Prophet Muhammad (SAWA) `did not leave the Muslim Ummah unguided regarding the divine leaders of Muslims after him, but he clearly informed the Ummah and asked them to give allegiance to Imam Ali (AS) being the first successor of the Prophet Muhammad (SAWA).

Shia Muslims follow the Prophetic Sunnah of the Prophet which is Been narrated by the most authentic source who are Ahlul Bayt (AS) and their pious followers.

The main difference between Shia and Sunni Muslims are in two issues: First : Who succeeds the Prophet in leading and guiding the Muslim Ummah?

Second: From where we should get the prophetic teachings ( Sunnah and Quranic meanings) after the Prophet Muhammad (SAWA).

Most of the tyrant governments like Bani Omayyah and Bani Abbas till today are against Shia Islam and played big role in defaming Shia Islam and spreading false propaganda against Shia.
Shia Muslims present evidence that they are following the original teachings of the Prophet (SAWA) not only from their books but also from the Sunni books and always call and practice dialogue.

You can find more details on this subject in many books written by ex Sunni scholars who reached to the reality of Shia Islam through scientific research like books of Dr Tijani and other scholars which can be seen in www.aqaid.com and www.al-Islam.org and many other websites.

Wassalam.

Yes, we can pray for our Sunni friends to be granted the light of following Ahlul Bayt (AS) who are the real source of the authentic Sunnah of the Prophet Muhammad (SAWA).

Wassalam.